Allows all users to see the 'Member Menu' not only those with a level via Paid Memberships Pro.

custom_memberlite_menus.php

<?php
/**
 * Remove Memberlite's wp_nav_menu_items filter.
 */
function remove_memberlite_wp_nav_menu_items_filter() {
	remove_filter( 'wp_nav_menu_items', 'memberlite_menus', 10, 2 );
}
add_action( 'after_setup_theme', 'remove_memberlite_wp_nav_menu_items_filter' );

/**
 * Show Member Menu to all Logged In Users.
 *
 * Allows all users to see the 'Member Menu' not only those with a level via Paid Memberships Pro.
 */
function custom_memberlite_menus( $items, $args ) {
	//is this the member menu location?
	if ( $args->theme_location == 'member' ) {
		if ( is_user_logged_in() ) {
			//user is logged in and has a membership level
			$items .= '<li><a href="'. esc_url( wp_logout_url() ) .'">' . __('Log Out','memberlite') . '</a></li>';
		} else {
			//not logged in
			$items = '<li><a href="'. esc_url( wp_login_url() ) .'">' . __('Log In','memberlite') . '</a></li>';	  
			$items .= '<li><a href="'. esc_url( wp_registration_url() ) .'">' . __('Register','memberlite') . '</a></li>';	  
		}
	}
	//is this the primary menu location?
	if ( $args->theme_location == 'primary' ) {
		$nav_menu_search = get_theme_mod( 'nav_menu_search', false );
		if ( ! empty( $nav_menu_search ) ) {
			$items .= get_search_form( false );
		}
	}
	return $items;
}
add_filter( 'wp_nav_menu_items', 'custom_memberlite_menus', 10, 2 );